My taskbar is on Windows 10 above and often Starts Minecraft so it goes from the screen and is in the taskbar. The only thing I can do is push the where else. It happens when Windows is started the first time in the day. It is very annoying. A screenshot I can only upload tomorrow because the bug shows only once a day.

P.S: I'am german. If you can please reply in german.

UPDATE!:
Also, I've noticed since the launcher every time it is started a little bit goes up.